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OCR Biology F212 Revision [3rd June 2013] (Now Closed) Watch

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    (Original post by theworld)
    Was ethanol DEG question, inhibiting?
    Nope. They can both be broken down my the enzyme, if you read the text book, you'd know ethanol was the natural substrate for alcohol dehydrogenase.
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    (Original post by theworld)
    Was ethanol DEG question, inhibiting?
    Part ii, yes
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    (Original post by Gotzz)
    I put cystine instead of glycine too!!!! :mad:
    wait x was cytosine!
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    (Original post by jackitsme)
    i think microscopes is an answer
    But microscope stuffs are in unit1.. evolution makes more sense to be in a unit2 exam isn't it?

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    I put poor diet, overcrowding and homelessness for the three reasons why people are more at risk for TB. I'm really started to doubt homelessness but my teacher told me that. D:
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    (Original post by niceguy95)
    7 marks or not


    For the selective breeding question

    I wrote about how it follows natural selection
    Best crops with best characteristics chosen and bred together until Hugh yielding crop.
    Resistance to diseases due mutation and genetic variation
    Crops with the resistance can on,y survive and reproduce
    Offspring are advantageous
    Alleles which cause this resistance passed over many generation
    Evolution occurs (long term) so crops with the resistance becomes more common I the population
    trouble is, that's not selextive breeding.
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    Am I the only one who said that the phagocyte has elastase enzymes which are used to digest elastic fibres so they can exit the blood into the tissue fluid? That was all I could think of at the time. So much pressure!
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    (Original post by Gotzz)
    I put cystine instead of glycine too!!!! :mad:
    I was so proud of myself for remembering a name of an amino acid aswell! :unimpressed:
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    (Original post by Deziah)
    I put poor diet, overcrowding and homelessness for the three reasons why people are more at risk for TB. I'm really started to doubt homelessness but my teacher told me that. D:
    You would get marks for homelessness, seriously, don't worry.
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    (Original post by own)
    Natural selection isn't the same as selective breeding?
    I know it's doesn't, It asked about resistance to disease and that due natural selection
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    (Original post by Musclemania)
    Am I the only one who said that the phagocyte has elastase enzymes which are used to digest elastic fibres so they can exit the blood into the tissue fluid? That was all I could think of at the time. So much pressure!
    Don't worry, it's only two marks.
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    (Original post by niceguy95)
    I know it's doesn't, It asked about resistance to disease and that due natural selection
    No, it asked how selective breeding could be used to produce resistant crops.
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    (Original post by Musclemania)
    Am I the only one who said that the phagocyte has elastase enzymes which are used to digest elastic fibres so they can exit the blood into the tissue fluid? That was all I could think of at the time. So much pressure!
    Thats for reaching inner edothelium,sorry
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    (Original post by niceguy95)
    I know it's doesn't, It asked about resistance to disease and that due natural selection
    They specifically said selective breeding
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    (Original post by Liamnut)
    trouble is, that's not selextive breeding.
    I didn't ask for, it asked long and short term reasons why they are resistant to disease, I on,y mentioned selective breeding process, the rest is explanation of natural selection which are Guidlines for resistance
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    (Original post by Liamnut)
    You would get marks for homelessness, seriously, don't worry.
    tb is spread by water droplets and extange of bood fluids...
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    X = nitrogenous base
    Y = nucleotide?

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    (Original post by theworld)
    Was ethanol DEG question, inhibiting?
    YES! You should have said it was a competitive inhibitor as they both acted as substrates
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    (Original post by jackitsme)
    Thats for reaching inner edothelium,sorry
    Isn't it due to histamine s making capillaries leaky, and high hydrostatic pressure?
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    (Original post by QuantumSuicide)
    X = nitrogenous base
    Y = nucleotide?

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    I think you actually have to name the base, as you did on a similar question in a past paper I did
 
 
 
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